(f) set forth at least one mode contemplated by the applicant for carrying out the invention and, where appropriate, this shall be done in terms of examples and with reference to the drawings, if any; and (g) indicate explicitly, when it is not obvious from the description or nature of the invention, the way in which the invention is industrially applicable and the way in which it can be made and used, or where it can only be used, the way in which it can be used. (2) The manner and order specified in paragraph (1) shall be followed except where, because of the nature of the invention, a different manner or a different order would result in a better understanding and presentation of the invention. 12. (1) Where there are several claims, they shall be numbered consecutively in Arabic numerals. (2) The claim shall define the invention in terms of the technical features of the invention. (3) (3) Whenever appropriate, a claim shall include – (a) a statement indicating those technical features of the invention which are necessary for the definition of the invention but which, in combination, are part of the prior art; and (b) a characterising portion preceded by the words "characterised in that", "characterised by", "wherein the improvement comprises", or any other words to the same effect and stating concisely the technical features which, in combination with the features stated under paragraph (a), the claim is desired to protect. (4) No claim shall rely, in respect of the technical features of the invention, on references or cross-references to any part of the description or drawings except where it is absolutely necessary to do so.